diff --git a/python/src/trezorlib/transport/thp/protocol_v2.py b/python/src/trezorlib/transport/thp/protocol_v2.py
index 483df64f7f..b073a0264d 100644
--- a/python/src/trezorlib/transport/thp/protocol_v2.py
+++ b/python/src/trezorlib/transport/thp/protocol_v2.py
@@ -486,5 +486,5 @@ def _get_error_from_int(error_code: int) -> str:
     if error_code == 4:
         return "INVALID DATA"
     if error_code == 5:
-        return "DEVICE_LOCKED"
+        return "DEVICE LOCKED"
     raise Exception("Not Implemented error case")